Yup. I think I'm getting better, but I'm still very prone to anxiety, and usually there's not much to be scared of. Though it's not often anxiety after the fact like it is with the OP, it's anticipation of mistakes I might make.
I tend to dismiss such anxiety these days, with a "don't be such a baby" attitude to it, but that way I still often get physical stress symptoms like shaking and poor concentration, which makes me slightly more accident-prone than usual, and the anxiety also tends to wreck my mood, so that my life seems a waste until the anxiety is over.
I think maybe a better way through would be to try to focus on the anxiety and express it, then look at the difference between the perceived and the imagined danger by asking questions such as "what's the worst thing that could happen?" and "what's the most likely outcome?" and "if the worst happened, what could I do to fix it?" There's something about laying out all the relevent facts and really thinking (and feeling) it through that seems to help. If I don't do that process of lifting the stuff into consciousness, all I have are fleeting impulses of though, and my behaviour stays in the hands of my (?) unconscious, intuitive self, which sometimes gets the best result but mostly just does something silly like running away or over-reacting. A heart without a head is a liability, for me.